No Oiling. Bolts feels SO smooth when you move it in and out of the marker. (No O-ring drag!). Relatively Cheap.

Weaknesses:

The System X quick-pull messed up once on me during a game the first day I used it. The ball bearing on one side would not go in when I pressed the quick-pull button. I could not get the bolt back into the back block! I had to gently bump the ballbearing on the grip frame while holding in the quick-pull button. That loosened up the ball bearing and I have had no problems since.

Conclusion:

I found no difference in FPS with this bolt vs my ANS quickpull. I never adjusted the regulator and both bolts would shoot the same FPS. It has 3 holes in the front of the bolt like some more expensive bolts. I really did not see any significant improvement over the ANS Quick pull that came with my ANS GX3. Plus I am worried about the ballbearings getting stuck again.